/*
 * Copyright (c) 2015, EURECOM (www.eurecom.fr)
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * The views and conclusions contained in the software and documentation are those
 * of the authors and should not be interpreted as representing official policies,
 * either expressed or implied, of the FreeBSD Project.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>


#include "TLVEncoder.h"
#include "TLVDecoder.h"
#include "TrackingAreaUpdateRequest.h"

int decode_tracking_area_update_request(tracking_area_update_request_msg *tracking_area_update_request, uint8_t *buffer, uint32_t len)
{
  uint32_t decoded = 0;
  int decoded_result = 0;

  // Check if we got a NULL pointer and if buffer length is >= minimum length expected for the message.
  CHECK_PDU_POINTER_AND_LENGTH_DECODER(buffer, TRACKING_AREA_UPDATE_REQUEST_MINIMUM_LENGTH, len);

  /* Decoding mandatory fields */
  if ((decoded_result = decode_u8_eps_update_type(&tracking_area_update_request->epsupdatetype, 0, *(buffer + decoded) >> 4, len - decoded)) < 0)
    return decoded_result;

  if ((decoded_result = decode_u8_nas_key_set_identifier(&tracking_area_update_request->naskeysetidentifier, 0, *(buffer + decoded) & 0x0f, len - decoded)) < 0)
    return decoded_result;

  decoded++;

  if ((decoded_result = decode_eps_mobile_identity(&tracking_area_update_request->oldguti, 0, buffer + decoded, len - decoded)) < 0)
    return decoded_result;
  else
    decoded += decoded_result;

  /* Decoding optional fields */
  while(len - decoded > 0) {
    uint8_t ieiDecoded = *(buffer + decoded);

    /* Type | value iei are below 0x80 so just return the first 4 bits */
    if (ieiDecoded >= 0x80)
      ieiDecoded = ieiDecoded & 0xf0;

    switch(ieiDecoded) {
    case TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI:
      if ((decoded_result =
             decode_nas_key_set_identifier(&tracking_area_update_request->noncurrentnativenaskeysetidentifier,
                                           TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI,
                                           buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI:
      if ((decoded_result =
             decode_ciphering_key_sequence_number(&tracking_area_update_request->gprscipheringkeysequencenumber,
                 TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI,
                 buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI:
      if ((decoded_result =
             decode_p_tmsi_signature(&tracking_area_update_request->oldptmsisignature,
                                     TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI,
                                     buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI:
      if ((decoded_result =
             decode_eps_mobile_identity(&tracking_area_update_request->additionalguti,
                                        TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI, buffer +
                                        decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI:
      if ((decoded_result =
             decode_nonce(&tracking_area_update_request->nonceue,
                          TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI, buffer + decoded,
                          len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI:
      if ((decoded_result =
             decode_ue_network_capability(&tracking_area_update_request->uenetworkcapability,
                                          TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI,
                                          buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI:
      if ((decoded_result =
             decode_tracking_area_identity(&tracking_area_update_request->lastvisitedregisteredtai,
                                           TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI,
                                           buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI:
      if ((decoded_result =
             decode_drx_parameter(&tracking_area_update_request->drxparameter,
                                  TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI, buffer +
                                  decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI:
      if ((decoded_result =
             decode_ue_radio_capability_information_update_needed(&tracking_area_update_request->ueradiocapabilityinformationupdateneeded,
                 TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI,
                 buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI:
      if ((decoded_result =
             decode_eps_bearer_context_status(&tracking_area_update_request->epsbearercontextstatus,
                                              TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI,
                                              buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI:
      if ((decoded_result =
             decode_ms_network_capability(&tracking_area_update_request->msnetworkcapability,
                                          TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI,
                                          buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI:
      if ((decoded_result =
             decode_location_area_identification(&tracking_area_update_request->oldlocationareaidentification,
                 TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI,
                 buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI:
      if ((decoded_result =
             decode_tmsi_status(&tracking_area_update_request->tmsistatus,
                                TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI, buffer +
                                decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI:
      if ((decoded_result =
             decode_mobile_station_classmark_2(&tracking_area_update_request->mobilestationclassmark2,
                 TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI,
                 buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI:
      if ((decoded_result =
             decode_mobile_station_classmark_3(&tracking_area_update_request->mobilestationclassmark3,
                 TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI,
                 buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI:
      if ((decoded_result =
             decode_supported_codec_list(&tracking_area_update_request->supportedcodecs,
                                         TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI, buffer +
                                         decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI:
      if ((decoded_result =
             decode_additional_update_type(&tracking_area_update_request->additionalupdatetype,
                                           TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI,
                                           buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT;
      break;

    case TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI:
      if ((decoded_result =
             decode_guti_type(&tracking_area_update_request->oldgutitype,
                              TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI,
                              buffer + decoded, len - decoded)) <= 0)
        return decoded_result;

      decoded += decoded_result;
      /* Set corresponding mask to 1 in presencemask */
      tracking_area_update_request->presencemask |= TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT;
      break;

    default:
      errorCodeDecoder = TLV_DECODE_UNEXPECTED_IEI;
      return TLV_DECODE_UNEXPECTED_IEI;
    }
  }

  return decoded;
}

int encode_tracking_area_update_request(tracking_area_update_request_msg *tracking_area_update_request, uint8_t *buffer, uint32_t len)
{
  int encoded = 0;
  int encode_result = 0;

  /* Checking IEI and pointer */
  CHECK_PDU_POINTER_AND_LENGTH_ENCODER(buffer, TRACKING_AREA_UPDATE_REQUEST_MINIMUM_LENGTH, len);

  *(buffer + encoded) = ((encode_u8_eps_update_type(&tracking_area_update_request->epsupdatetype) & 0x0f) << 4) | (encode_u8_nas_key_set_identifier(
                          &tracking_area_update_request->naskeysetidentifier) & 0x0f);
  encoded++;

  if ((encode_result =
         encode_eps_mobile_identity(&tracking_area_update_request->oldguti, 0,
                                    buffer + encoded, len - encoded)) < 0)        //Return in case of error
    return encode_result;
  else
    encoded += encode_result;

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_PRESENT) {
    if ((encode_result =
           encode_nas_key_set_identifier(&tracking_area_update_request->noncurrentnativenaskeysetidentifier,
                                         TRACKING_AREA_UPDATE_REQUEST_NONCURRENT_NATIVE_NAS_KEY_SET_IDENTIFIER_IEI,
                                         buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_PRESENT) {
    if ((encode_result =
           encode_ciphering_key_sequence_number(&tracking_area_update_request->gprscipheringkeysequencenumber,
               TRACKING_AREA_UPDATE_REQUEST_GPRS_CIPHERING_KEY_SEQUENCE_NUMBER_IEI,
               buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_PRESENT) {
    if ((encode_result =
           encode_p_tmsi_signature(&tracking_area_update_request->oldptmsisignature,
                                   TRACKING_AREA_UPDATE_REQUEST_OLD_PTMSI_SIGNATURE_IEI, buffer +
                                   encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_PRESENT) {
    if ((encode_result =
           encode_eps_mobile_identity(&tracking_area_update_request->additionalguti,
                                      TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_GUTI_IEI, buffer +
                                      encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_NONCEUE_PRESENT) {
    if ((encode_result =
           encode_nonce(&tracking_area_update_request->nonceue,
                        TRACKING_AREA_UPDATE_REQUEST_NONCEUE_IEI, buffer + encoded, len -
                        encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_PRESENT) {
    if ((encode_result =
           encode_ue_network_capability(&tracking_area_update_request->uenetworkcapability,
                                        TRACKING_AREA_UPDATE_REQUEST_UE_NETWORK_CAPABILITY_IEI, buffer +
                                        encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_PRESENT) {
    if ((encode_result =
           encode_tracking_area_identity(&tracking_area_update_request->lastvisitedregisteredtai,
                                         TRACKING_AREA_UPDATE_REQUEST_LAST_VISITED_REGISTERED_TAI_IEI,
                                         buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_PRESENT) {
    if ((encode_result =
           encode_drx_parameter(&tracking_area_update_request->drxparameter,
                                TRACKING_AREA_UPDATE_REQUEST_DRX_PARAMETER_IEI, buffer + encoded,
                                len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_PRESENT) {
    if ((encode_result =
           encode_ue_radio_capability_information_update_needed(&tracking_area_update_request->ueradiocapabilityinformationupdateneeded,
               TRACKING_AREA_UPDATE_REQUEST_UE_RADIO_CAPABILITY_INFORMATION_UPDATE_NEEDED_IEI,
               buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_PRESENT) {
    if ((encode_result =
           encode_eps_bearer_context_status(&tracking_area_update_request->epsbearercontextstatus,
                                            TRACKING_AREA_UPDATE_REQUEST_EPS_BEARER_CONTEXT_STATUS_IEI, buffer
                                            + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_PRESENT) {
    if ((encode_result =
           encode_ms_network_capability(&tracking_area_update_request->msnetworkcapability,
                                        TRACKING_AREA_UPDATE_REQUEST_MS_NETWORK_CAPABILITY_IEI, buffer +
                                        encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_PRESENT) {
    if ((encode_result =
           encode_location_area_identification(&tracking_area_update_request->oldlocationareaidentification,
               TRACKING_AREA_UPDATE_REQUEST_OLD_LOCATION_AREA_IDENTIFICATION_IEI,
               buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_PRESENT) {
    if ((encode_result =
           encode_tmsi_status(&tracking_area_update_request->tmsistatus,
                              TRACKING_AREA_UPDATE_REQUEST_TMSI_STATUS_IEI, buffer + encoded,
                              len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_PRESENT) {
    if ((encode_result =
           encode_mobile_station_classmark_2(&tracking_area_update_request->mobilestationclassmark2,
               TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_2_IEI,
               buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_PRESENT) {
    if ((encode_result =
           encode_mobile_station_classmark_3(&tracking_area_update_request->mobilestationclassmark3,
               TRACKING_AREA_UPDATE_REQUEST_MOBILE_STATION_CLASSMARK_3_IEI,
               buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_PRESENT) {
    if ((encode_result =
           encode_supported_codec_list(&tracking_area_update_request->supportedcodecs,
                                       TRACKING_AREA_UPDATE_REQUEST_SUPPORTED_CODECS_IEI, buffer +
                                       encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_PRESENT) {
    if ((encode_result =
           encode_additional_update_type(&tracking_area_update_request->additionalupdatetype,
                                         TRACKING_AREA_UPDATE_REQUEST_ADDITIONAL_UPDATE_TYPE_IEI, buffer +
                                         encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  if ((tracking_area_update_request->presencemask & TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT)
      == TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_PRESENT) {
    if ((encode_result =
           encode_guti_type(&tracking_area_update_request->oldgutitype,
                            TRACKING_AREA_UPDATE_REQUEST_OLD_GUTI_TYPE_IEI,
                            buffer + encoded, len - encoded)) < 0)
      // Return in case of error
      return encode_result;
    else
      encoded += encode_result;
  }

  return encoded;
}

